Description:White crystals or crystalline powder State of Solution:Clear and Colorless Chloride:<0.020% Ammonium(NH4):<0.02% Sulfate(SO4):<0.020% Iron(Fe):<10ppm Heavy Metals (Pb):<10ppm Arsenic:<1ppm PH:6-7 Loss on Drying:<0.30% Residue In Ignition (Sulfated):<0.10% Assay:99.9% Packing:25kg/drum